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Question: Answered & Verified by Expert
In a given process on an ideal gas, dW = 0 and dQ < 0. Then for the gas
PhysicsThermodynamicsNEET
Options:
  • A The temperature will decrease
  • B The volume will increase
  • C The pressure will remain constant
  • D The temperature will increase
Solution:
2577 Upvotes Verified Answer
The correct answer is: The temperature will decrease
From the first law of thermodynamics

           dQ = dU + dW

Hence dW = (given)

 dQ = dU

Now since dQ < 0 (given)

∴    dQ is negative dU = - ve

 dU decreases  Temperature decreases

 The correct option is (1).

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